57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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Copyright (C) 2022 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string>
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#include "temporal/tempo.h"
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#include "public_editor.h"
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/* RAII for tempo map edits. This object manages both Tempo map RCU stuff, plus
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* reversible command state, removing the need for repeated boilerplate at each
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* map edit site.
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*
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* One complication: GUI tempo map markers are all reassociated with the
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* relevant points of the write-copy of the map during ::begin() (typically
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* called in the constructor, unless it's begin argument is false). You must
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* delay getting a reference on a point to edit until after the TempoMapChange
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* object has called begin() (i.e. has been constructed), otherwise the
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* reference will point to the "old" copy of the map.
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*/
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class TempoMapChange {
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public:
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TempoMapChange (PublicEditor& e, std::string const & name, bool update_on_commit = true, bool begin = true);
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~TempoMapChange ();
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void begin ();
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void abort ();
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void use_new_map (Temporal::TempoMap::WritableSharedPtr);
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Temporal::TempoMap& map() const { return *writable_map.get(); }
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private:
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PublicEditor& editor;
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Temporal::TempoMap::WritableSharedPtr writable_map;
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std::string name;
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bool aborted;
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bool begun;
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bool update_on_commit;
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XMLNode* before;
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};
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